@article{GDZPPN002109727, title = {Geodesics on S2 and periodic points of annulus homeomorphisms.}, journal = {Inventiones mathematicae}, volume = {110}, year = {1992}, pages = {403-418}, zbl = {0766.53037}, url = {http://dml.mathdoc.fr/item/GDZPPN002109727} }
Franks, John. Geodesics on S2 and periodic points of annulus homeomorphisms.. Inventiones mathematicae, Tome 110 (1992) pp. 403-418. http://gdmltest.u-ga.fr/item/GDZPPN002109727/